docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/T/TESObjectACTIDefs.h

@@ -0,0 +1,18 @@
+#pragma once
+
+namespace RE
+{
+	namespace TESObjectACTIDefs
+	{
+		struct alignas(0x08) RadioReceiverData
+		{
+		public:
+			BGSSoundOutput* outputOverride;  // 00
+			float           frequency;       // 08
+			float           volume;          // 0C
+			bool            active;          // 10
+			bool            noStatic;        // 11
+		};
+		static_assert(sizeof(RadioReceiverData) == 0x18);
+	}
+}